Abstract: Apparatus for handling of fluids contaminated by solid objects and/or being partly solidified comprises a displacement pump of the screw type, as well as a cutter device driven by the pump shaft. The cutter device comprises a cylindrical drum with a number of axially directed edge steel, spaced apart a suitable distance to ensure a maceration of solid objects to a size suited for passing through the pump. The drum is located adjacent to an opening in the side wall of the pump housing. The pump is preferably reversible, and the material in the cutter device is selected so as to ensure a non-sparking structure.